De or het managementondersteuning?

The correct Dutch article is:

de managementondersteuning

Rule Words ending in -ing: almost always de. See the rule

How to use managementondersteuning

the managementondersteuningde managementondersteuning
this managementondersteuningdeze managementondersteuning
that managementondersteuningdie managementondersteuning
our managementondersteuningonze managementondersteuning
your managementondersteuningjouw managementondersteuning
every managementondersteuningelke managementondersteuning
which managementondersteuning?welke managementondersteuning?
a big managementondersteuning / the big managementondersteuningeen grote managementondersteuning, de grote managementondersteuning